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elh0033g/883/8001401ZX july 1992 rev h elh0033g/883/8001401ZX fast buffer amplifier note: all information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a ``controlled document''. current revisions, if any, to these specifications are maintained at the factory and are available upon your request. we recommend checking the revision level before finalization of your design documentation. patent pending. ? 1989 elantec, inc. features # slew ratee1500 v/ m s # output drivee100 ma # rise and fall timese2.9 ns # input resistancee10 11 x # power bandwidthe100 mhz # mil-std-883 devices 100% manufactured in u.s.a. advantages # excellent phase linearity # driver cables and other capacitive loads # wide supply range, single or split ordering information part no. temp. range package outline y elh0033g/883b b 55 cto a 125 c to-8 mdp0002 8001401ZX is the smd version of this device. connection diagram 12-pin to-8 0033 1 top view note: case is electrically isolated. general description the elh0033 is a high-speed, fet input voltage follower buff- er designed to provide high output currents from dc to over 100 mhz. the elh0033 slews at 1500 v/ m s and will drive 100 x loads. phase linearity is excellent to 20 mhz, allowing the buff- er to be included in op amp loops. the elh0033 is intended to fulfill a wide range of buffer appli- cations such as high-speed line drivers, video impedance trans- formation, nuclear instrumentation amplifiers, op amp isolation buffers for driving reactive loads and high impedance input buffers for high-speed a to d's and comparators. these devices are constructed using specially selected junction fets and active laser trimming to achieve guaranteed perform- ance specifications. the elh0033 is specified for operation from b 55 cto a 125 c. elantec facilities comply with mil-i-45208a and other applica- ble quality specifications. elantec's military devices are 100% fabricated and assembled in our rigidly controlled, ultra-clean facilities in milpitas, california. for additional information on elantec's quality and reliability assurance policy and proce- dures request brochure qra-1. equivalent schematic 0033 2
elh0033g/883/8001401ZX fast buffer amplifier absolute maximum ratings v s supply voltage (v ab v b ) 40v v in input voltage 40v p d power dissipation (see curves) 1.5w i oc continuous output current g 100 ma i op peak output current g 250 ma t a operating temperature range elh0033 b 55 cto a 125 c t j operating junction temperature 175 c t st storage temperature b 65 cto a 150 c lead temperature (soldering, 10 seconds) 300 c important note: all parameters having min/max specifications are guaranteed. the test level column indicates the specific device testing actually performed during production and quality inspection. elantec performs most electrical tests using modern high-speed automatic test equipment, specifically the ltx77 series system. unless otherwise noted, all tests are pulsed tests, therefore t j e t c e t a . test level test procedure i 100% production tested and qa sample tested per qa test plan qcx0002. ii 100% production tested at t a e 25 c and qa sample tested at t a e 25 c, t max and t min per qa test plan qcx0002. iii qa sample tested per qa test plan qcx0002. iv parameter is guaranteed (but not tested) by design and characterization data. v parameter is typical value at t a e 25 c for information purposes only. dc electrical characteristics v s e g 15v, v in e 0v, t min s t a s t max parameter description test conditions elh0033 units min typ max test level v os output offset r s s 100 k x , 510 i mv voltage t j e 25 c (note 1) r s s 100 k x 15 i mv d v os / d t average temperature coefficient of r s e 100 x 50 v m v/ c offset voltage i b input bias current t j e 25 c (note 1) 250 i pa t a e 25 c (note 2) 2.5 iv na t j e t a e t max 10 i na a v voltage gain r s e 100 x ,r l e 1k x , 0.97 0.98 1.00 i v/v v in e g 10v r in input impedance r l e 1k x 10 10 10 11 iv x t j e 25 c (note 1), 10 10 10 11 i x r l e 1k x r o output impedance r l e 1k x ,v in e g 1v 6 10 i x v o output voltage v in e g 14v, g 12 i v swing r l e 1k x v in e g 10.5v, g 9iv r l e 100 x ,t a e 25 c i s supply current 14.5 20 22 i ma power consumption 600 660 i mw note 1: specification is at 25 c junction temperature due to requirements of high-speed automatic testing. actual values at operating temperature will exceed the value at t j e 25 c. when supply voltages are g 15v, no-load operating junction temperature may rise 40 c60 c above ambient and more under load conditions. accordingly, v os may change one to several mv, and i b will change significantly during warm-up. refer to i b vs temperature graph for expected values. note 2: measured in still air 7 minutes after application of power. 2 td is 3.4in
elh0033g/883/8001401ZX fast buffer amplifier ac electrical characteristics t c e 25 c, v s e g 15v, r s e 50 x ,r l e 1k x parameter description test conditions elh0033 units min typ max test level sr slew rate v in e g 10v 1000 1500 iii v/ m s bw bandwidth v in e 1v rms 100 v mhz phase bw e 1 mhz to 20 mhz 2v non-linearity t r rise time d v in e 0.5v 2.9 v ns t p propagation delay d v in e 0.5v 1.2 v ns hd harmonic distortion f l 1 khz k 0.1 v % a v voltage gain r s e 100 x , v in e 1v rms , 0.97 0.98 1.00 i v/v f e 1 khz r o output impedance v in e 1v rms , 610 i x f e 1 khz typical performance curves dissipation maximum power supply voltage supply current vs supply voltage output voltage vs response negative pulse response positive pulse frequency response 0033 3 3 td is 2.3in
elh0033g/883/8001401ZX fast buffer amplifier typical performance curves e contd. vs temperature rise and fall time vs temperature input bias current current during warm-up normalized input bias vs input voltage input bias current 0033 4 typical applications offset zero adjust 0033 5 using resistor current limiting 0033 6 current limiting using current sources 0033 7 4
elh0033g/883/8001401ZX fast buffer amplifier typical applications e contd. high input impedance ac coupled amplifier f h t 100 mhz 0033 8 coaxial cable driver 0033 9 * select c1 for optimum pulse response instrumentation shield/line driver 0033 10 single supply ac amplifier 0033 11 4.5 mhz notch filter f o e 1 2 q r1c1 r1 e 2r2 c1 e c2 2 0033 12 high-speed sample and hold * polycarbon or teflon 0033 13 5
elh0033g/883/8001401ZX fast buffer amplifier applications information recommended layout precautions rf/video printed circuit board layout rules should be followed when using the elh0033 since it will provide power gain to frequencies over 100 mhz. ground planes are recommended and power supplies should be decoupled at each device with low inductance capacitors. in addi- tion, ground plane shielding may be extended to the metal case of the device since it is electrically isolated from internal circuitry. alternatively, the case should be connected to the output to minimize input capacitance. offset voltage adjustment the elh0033's offset voltages have been active- ly trimmed by laser to meet guaranteed specifica- tions when the offset preset pin is shorted to the offset adjust pin. the pre-calibration allows the devices to be used in most dc or ac applications without individually offset nulling each device. if offset null is desirable, it is simply obtained by leaving the offset preset pin open and connecting a trim pot of 100 x between the offset adjust pin and v b . operation from single or asymmetrical power supplies this device type may be readily used in applica- tions where symmetrical supplies are unavailable or not desirable. a typical application might be an interface to a mos shift register where v a e a 5v and v b eb 12v. in this case, an apparent output offset occurs due to the device's voltage gain of less than unity. this additional output offset error may be predicted by: d v o j (1 b a v ) (v a b v b ) 2 e 0.005 (v a b v b ) where: a v e no load voltage gain, typically 0.99 v a e positive supply voltage v b e negative supply voltage for the above example, d v o would be b 35 mv. this may be adjusted to zero as described in sec- tion 2. for ac coupled applications, no addition- al offset occurs if the dc input is properly biased as illustrated in the ``typical applications'' sec- tion. short circuit protection in order to optimize transient response and out- put swing, output current limit has been omitted from the elh0033. short circuit protection may be added by inserting appropriate value resistors between v a and v c a pins and v b and v c b pins. resistor values may be predicted by: r lim j v a i sc e v b i sc where: i sc s 100 ma for elh0033 the inclusion of limiting resistors in the collec- tors of the output transistors reduces output volt- age swing. decoupling v c a and v c b pins with capacitors to ground will retain full output swing for transient pulses. an alternate active current limit technique that retains full dc output swing uses current sources which are saturated during normal operation thus applying full supply volt- age to the v c pins. under fault conditions, the voltage decreases as required by the overload. r lim j v be i sc e 0.6v 60 ma e 10 x capacitive loading the elh0033 is designed to drive capacitive loads such as coaxial cables in excess of several thousand picofarads without susceptibility to os- cillation. however, peak current resulting from (c c d v /d t ) should be limited below absolute maximum peak current ratings for the devices. thus: d v in d t c c l s i out s g 250 ma in addition, power dissipation resulting from driving capacitive loads plus standby power should be kept below the total package power rating: p d pkg t p dc a p ac p d pkg t (v a b v b ) c i s a p ac p ac j (v p-p ) 2 c f c c l 6
elh0033g/883/8001401ZX fast buffer amplifier where: v p-p e peak-to-peak output voltage swing f e frequency c l e load capacitance operation within an op amp loop both devices may be used as a current booster or isolation buffer within a closed loop with op amps such as the elh0032 and ha2500 and ha2600 series. an isolation resistor of 47 x should be used between the op amp output and the input of elh0033. the wide bandwidth and high slew rates of the elh0033 assure that the loop has the characteristics of the op amp and that additional rolloff is not required. burn-in circuit 0033 14 hardware in order to utilize the full drive capabilities of the elh0033, it should be mounted with a heatsink, particularly for extended temperature operation. the case is isolated from the circuit and may be connected to system chassis. important! power supply bypassing is necessary to prevent oscillation with the elh0033 in all circuits. low inductance ceramic disc capacitors with the shortest practical lead lengths must be connected from each supply lead (within (/4 to (/2 of the device package) to a ground plane. capacitors should be one or two 0.1 m f in parallel; adding a 4.7 m f solid tantalum capacitor will help in trou- blesome instances. 7
elh0033g/883/8001401ZX fast buffer amplifier elh0033 macromodel * connections: input * l v a * ll vc a * lll v b * llll vc b * lllll output * llllll .subckt m0033 5 12 1 10 9 11 * models .model qn npn (is e 5e b 14 bf e 150 vaf e 100 re e 1rb e 5re e 1 ikf e 200ma a cje e 5pf cjc e 5pf mje e .42 mjc e .23 tf e .3ns tr e 200ns br e 5 vtf e 0) .model qp pnp (is e 5e b 14 bf e 150 vaf e 100 rc e .2 rb e 3re e 1 ikf e 100ma a cje e 5.7pf cjc e 4pf tf e .3ns mje e .32 mjc e .43 tr e 170ns br e 5 vtf e 0) .model qf njf (vto eb 3v beta e 4.0e b 3 cgd e 4pf cgs e 10pf lambda e 671.0e b 6) * resistors r1 20 21 58.33 r2 27 10 58.33 r3 22 11 2 r4 11 23 2 * transistors j112520qf j4 24 10 26 qf q2 21 21 25 qn q3 24 24 25 qp q512122qn q692423qp q7 26 26 27 qn .ends 8 tab wide td is 3.8in
elh0033g/883/8001401ZX fast buffer amplifier elh0033 macromodel e contd. 0033 16 9
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elh0033g/883/8001401ZX july 1992 rev h elh0033g/883/8001401ZX fast buffer amplifier general disclaimer specifications contained in this data sheet are in effect as of the publication date shown. elantec, inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. elantec, inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. elantec, inc. 1996 tarob court milpitas, ca 95035 telephone: (408) 945-1323 (800) 333-6314 fax: (408) 945-9305 european office: 44-71-482-4596 warning e life support policy elantec, inc. products are not authorized for and should not be used within life support systems without the specific written consent of elantec, inc. life support systems are equipment in- tended to support or sustain life and whose failure to perform when properly used in accordance with instructions provided can be reasonably expected to result in significant personal injury or death. users contemplating application of elantec, inc. products in life support systems are requested to contact elantec, inc. factory headquarters to establish suitable terms & conditions for these applications. elantec, inc.'s warranty is limited to replace- ment of defective components and does not cover injury to per- sons or property or other consequential damages. printed in u.s.a. 12

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